Sensor unit and motion analysis device

Abstract

A sensor unit includes a motion sensor which detects a motion of an object, outputs a detection value, and is mounted on the object through an attachment, a filter which receives the detection value, passes a given frequency band, and is able to change a cutoff frequency of the frequency band, and a control unit which controls the cutoff frequency, wherein the control unit determines the cutoff frequency in accordance with hardness of the attachment.

What is claimed is: 
     
       1. A sensor unit comprising:
 a motion sensor which is mounted on an object through an attachment; 
 a filter which receives a detection value from the motion sensor, passes a given frequency band, and is able to change a cutoff frequency of the frequency band; and 
 a control unit which controls the cutoff frequency, 
 wherein the control unit determines the cutoff frequency in accordance with hardness of the attachment. 
 
     
     
       2. The sensor unit according to  claim 1 , further comprising:
 a storage unit which stores table information, in which the cutoff frequency is determined in accordance with hardness of the attachment, 
 wherein the control unit controls the cutoff frequency using the table information. 
 
     
     
       3. The sensor unit according to  claim 1 , further comprising:
 a pressure sensor, 
 wherein the pressure sensor measures a pressure value when the sensor unit is attached to the attachment, and outputs the pressure value to the control unit. 
 
     
     
       4. The sensor unit according to  claim 3 ,
 wherein the pressure sensor is a piezoresistive pressure sensor. 
 
     
     
       5. The sensor unit according to  claim 1 , further comprising:
 an operating unit which receives information regarding hardness of the attachment from the outside of the sensor unit and outputs the information regarding hardness to the control unit. 
 
     
     
       6. The sensor unit according to  claim 1 ,
 wherein, when the attachment is harder than a predetermined hardness, the control unit generates a control signal such that the cutoff frequency of a high-frequency band is lowered. 
 
     
     
       7. The sensor unit according to  claim 1 ,
 wherein, when the attachment is softer than a predetermined hardness, the control unit generates a control signal such that the cutoff frequency of a low-frequency band is lowered. 
 
     
     
       8. A motion analysis device comprising:
 the sensor unit according to  claim 1 . 
 
     
     
       9. The sensor unit according to  claim 1  wherein the frequency band is defined between a high-cutoff frequency band and a low-cutoff frequency band, and the control unit adjusts at least one of the high-cutoff frequency band or the low-cutoff frequency band to change the cutoff frequency.